the profecy might refer to this creation though. its a funny idea thou the choosen one was supposed to bring balance to the force. balance is the key word, if one is all light they are not balanced, same goes if they are all dark. i think anakin had to go through both inorder to truely bring balance. if you read on in the EU u find that the most powerful jedi use both good and bad parts of the force. mace is able to defeat Palps cus he used a technique that draws on the dark side, read the novel and u'll know, same goes for some luke, kyp, jacen, Anakin Solo, and jania. if you read there stories all of them experenced the Darkside and through that became more powerful, through anakin balance was restorted by distroying both the sith and the Jedi, the forcehad become polar opposites b4 him and after him you see the new knights combining the force, it is most evidently seen in NJO series, where jacen has some pretty cool revolations about he force, read Traitor that will fil you in.